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Commitments and Contingencies (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]  
Contractual amount net of risk participations $ 77,000
Guarantee Obligations [Member]  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 9,080,108
Letters of credit  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 153,372
Commitments to fund commercial and industrial loans  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 5,090,827
Commitments to fund commercial real estate, construction, and land development loans  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 1,567,583
Commitments under home equity lines of credit  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 1,137,714
Unused credit card lines  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments 779,254
Other loan commitments  
Loss Contingencies [Line Items]  
Total letters of credit and unfunded lending commitments $ 351,358